Hammer-drill.



A. H. TAYLOR.

- HAMMER DRfLL. APPLIQATION PILED JUNE 5, 1909.

982,397. Pate ted Jan. 24, 1911.

- v 2 a? I a 20 mz enr.

' citizen of the United States, and resident of of which the following is a specification.

the pressure fluid to the cutting faces I in section.

-of the anvil block 2.to form a fluid-tight packing to prevent the pressure fl 111d from working back into the hammer cylinder. A

-UNITED s'rA'rns PATENT OFFICE.

- ALBERT H. TAYLOR, OF EASTON, PENNSYLVANIA. ASSIGNOR TO INGERSOLL-RAND COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

HAMMER-DRILL.

Specification of Letters Patent.

Patented Jan. 24:, 1911.

Application filed June 5, 1909. Serial No. 500,279.

To all whom it may concern:

. Be it known that I, ALBERT H. TAYLOR, a

Eastonfin the county of Northan'ipton and State of Pennsylvania, have invented a new and useful Improvement in Hammer-Drills,

This invention relates to improvements in hammer drills and has for its object to provide certain improvements in the construction, form and arrangement of the several parts at the front end of the drill whereby the leakage of the pressure fluid around the drill steel within the front head is prevented thus insuring a constant supply of through the drill steel.

. Inthe accompanying drawings, Figure 1 represents in side elevation the front end of a hammer drill embodying this invention, Fig. 2 is a longitudinal central section through the same, taken in the plane of the line AA of Fig. 1, Fig. 3 is a front end view of the drill, the drill steel being shown Fig. 4; is a'transverse section taken in the planeof the line B-B of Fig. 2, Fig. 5 is a transverse section taken in the plane of the line C C of Fig. 2, Fig. (i is a detail View in perspective of the elastic washer which forms the fiuid tight packing for the drill steel within the front head, and Fig. 7 is a detail longitudinal central section through the drill in a plane at right angles to Fig; 2. a

The hammer cylinder is denoted by 1 and its anvil block by 2. The front head 3 which forms the drill steel holder is secured to' the front end of the hammer cylinder as, for instance, by being screwed thereon, and it is-locked iii-position by a clamping ring at. This front head is provided with a reduced bore 5, intermediate inner and outer enlarged bores 6 and 7 through which re duced bore the shank of the hollow drill steel 8 is inserted into position to have its end engaged by the anvil block 2. This reduced bore 5 in the front head is made to conform to the cross sectional shape of the drill steel.

A cup-washer 9 is located around the head )ressure fluid chamber 10 surrounds the head of theanvil block 2. The bore 11 of is in alinement with the bore 11 in the drill steel and the transverse branch of duct opens into the chamber 10.

Apressnre fluid supply pipe 13 is secured which .to a hole 14 in the side wall of the front head 111 communication with the chamber 10. An elastic washer 15, preferably of rubber, is inserted within the outer en larged bore 7 of the front head, the bore of which washer conforms to the cross sectional shape of the'drill steel 8. A bushing 16 islocated in front of the elastic washer 15, which bushing is locked against rotary movement with respect to the front head but permitted a longitudinal movement with respect thereto, for instance, by providing jhe outer end of the front head with open ended slots 17, 18, and the bushing 16 with lugs 19, 20, entering said slots.

The bore of the bushing 16 conforms to the cross sectional shape of the drill steel 8. The elastic washer 1i and the bushing 16 are interlocked, as, for instance, by providing the elastic washer with a flattened lug 21 on its outer face and the bushing with a recess 22 in its inner face for receiving said lug. A nut- 23 has a screw threaded engagement with the outep end of the fronthead 3 and also engages the bushing 16. This not is yieldiugly heldin any of its rotatively adjustable. positions as, for instance, by providmg its inner end with an interior annular series of ratchet teeth 24 arranged to be engaged by a spring pressed pawl 25 seated in thefront heath The spring which forces the pawl into engagement with the teeth 24 is denoted by 26 and the pawl is limited as to its outward moren'ieut by a circiuuferential hand spring 2'i' so.as-to pern-it'the removal of the out without displacement of the pawl.

In operatioii, the nut 23 is first unscrewed sulliciently to remove the pressure of the bushing 16 on the elastic washer 15. The

drill steel is thenjnserted into its position through the bushing 16, the washer 15 and the small bore 5 of the front head. The nut 23 is then screwed inwardly thus causing the bushing 16 to insert a sullicient amount of pressure upon the elastic washer 15 to cause it to expand to form a fluid-tight joint .be-

tween the drill steel and the front head.

'lhe fluid-may then be introduced through the supply pipe 13 into the hollow'drill steel. It will be seen that the'elastic washer 15 absolutely prevents the leakage of the pressure fluid; as it is .being fed to thedrill steel. \Vhen it is desired to remove the drill steel,

' the nut 23 is'unscrewed sufiiciently to cause the bushing to remove its pressure from the elastic washer l5 and thus free the drill steel from the grip of the elastic washer. The pawl and ratchet connection between the front head and nut serves to'prevent the vibrations of the drill from causing the nut to unscrew. The drill structure shown and described but not claimed herein, forms the subject matter of a.- copending application filed by ine February 19,'1909,,Serial No. 478,795.

l. A drill steel, its holder, an elastic washer. and means for causing the Washer to gripand release the steel comprising/abushing having a longitudinal sliding interlocked c0nnection.with the holder and 1a bushing engaging nut having a screw threaded ene gagement with the holder; 2. A drill steel, its holder, an elastic washer and means for causing the washer togrip and release the steel comprising a bushmg having a longitudinal sliding interlocked connection with the holder, a bushing engag ing nut having a screw threadedengagement with the holder and means for'.-lockin the nut to the holder against unintentiona displacement. f

3. A drill steel, its. holder, an elastic washer and Jneans for causing .the washer to 'grip and releasej the steel eomprisin a bushing interlocked'jvith the washer an a bush ing engaging nut having a s'crew threaded engagementwith the-iliolderl.

4. A drill steel, as holder; an'zelastic washer and means for'causing the washer to grip and release the steel comprising a .bushing interlocked swith the washer, a bushing engaging nuthavinga screw threaded enagement with the holderand means for ocking the 'nutito theholder against unintentional displacement r 5. A drill steel, its'holder, an elastic washer and means for causing the washer to grip and release the sto'el comprisin a bushing interlocked with the'washer an having a longitudinal sliding interlocked connection with theholder and a bushing engaging nut having a screw threaded engagement with the holder.

' ing, a bushing. engaging nut 'gagement with 't G. A drill steel, itsholder, an elastic portion, means for causing the washer to grip .6 and release the steel comprising abushing interlocked with the washer and having a y longitudinal sliding. interlocked connection with the holder, a bushing engaging nut having a screw threaded engagement-with the-6 holder and means for locking the nut to theholder against unintentional displacement.

7. A drill steel, its holder, an elastic washer and means for causing the washer to grip and release the steel com aihush ing, abushing engaging nut avin -h;ScreW threaded engagement with the'ho dei' 'aiidf' means for locking the nut to} theholder'; against unintentional displacement, compris' ing a pawl and ratchet connection blatwen the holder and nut. 1

8. A drill steel, its holder, an elastic washer and means for causing the washer to grip and release the steel comprising a bushthreaded enga ement with theh der'yand means" for 100 ing .the nut to =the h'older' against unintentional displacement', 'comprising an annular series of ratchet teethonj-the nutand a spring pressed pawl by the I holder.

aving a screw 80 a A drill steel, a aiiaer,-an' nsac the steel. t v V 10. A; drill stee1, its holder, an elastic washer, abushing having a longitudinal sliding interlocking wounection with' th'e" holder. and means for forcing the bushing washer, a bushing nd master forcing the? bushmg inwardly to cause the washer to grip inwardly to cause the washer to grip the cause the washer to grip the steel. In testimony,.that I claim the foregoing as;

my invention, I havesigned my name inii presence of two witnesses, this third dayof 110 June, 1909. I Q 1 ALBERT H. TAYLO Witnesses: v

' WARD RAYMOND,

.RUSISELL H..Wn.manm.

ardly to cause the terlockedfconnectlon with the holder and lot means for forcing the bushing inwardly to 

